Dating App - Firebase Realtime Database Schema - Messages

laganMessageSchema.jsonc

"messages": {
    "$chat_id": {
      	// Only users who are on this chat can read/write
        ".read": "root.child('chats/' + $chat_id + '/members/' + auth.uid).exists()",
        ".write": "root.child('chats/' + $chat_id + '/members/' + auth.uid).exists()",
        	
        "$message_id": {
            // the object to write must have required nodes, and also an existing msg can't be rewritten
            ".validate": "!data.exists() && newData.hasChildren(['message', 'author', 'timestamp'])",

            // the message must be longer than 0 chars and less than 50
            "message": { ".validate": "newData.isString() && newData.val().length > 0 && newData.val().length < 50" },
            "author": { ".validate": "newData.val() === auth.uid" },

            "timestamp": { ".validate": "newData.val() <= now" },
            // no other fields can be included in a message
            "$other": { ".validate": false }
        }
    },
}